Etymology
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blockhead (n.)

also block-head, "stupid person," 1540s (implied in blockheaded), from block (n.1) + head (n.); probably originally an image of the head-shaped oaken block used by hat-makers, though the insulting sense is equally old.

updated on June 11, 2017

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Definitions of blockhead from WordNet

blockhead (n.)
a stupid person; these words are used to express a low opinion of someone's intelligence;
Synonyms: dunce / dunderhead / numskull / bonehead / lunkhead / hammerhead / knucklehead / loggerhead / muttonhead / shithead / dumbass / fuckhead
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.